we're getting new details in the search for malaysia flight 370 where the bluefin underwater search device has just wrapped up its 18th mission without finding any, any debris. we're learning this isn't the end of its deployment, though. anna is joining us from perth, australia. what can you tell us, anna? >> reporter: wolf, far from the end of this search, if anything, it's just gearing up. as you say, the 18th mission has completed with no sign of debris from mh-370. now, we know that the "ocean shield" will be coming back to port here in perth in the next few days to restock and refuel before heading back out. we know that the search is heading into a new phase, which will cover an area of some 20,000 square miles north to where they have been searching. we believe that this will take, according to authorities, between eight months to a year to cover this entire area. but as far as authorities are concerned, they are meeting in kambra and we'll be there to tell you what happens. >> anna coren in perth for us. let's bring in miles o'brien and cnn's richard quest. what do you make of the